Click to draw! To change colour tap on the colour on the side to change to that colour. click on the trash can to erase everything or the Green flag. To change the size of the pen, click and hold and go side to side. Bugs: when you are drawing in the code it can put dots instead of lines, For people who are on ipads, tablets and phones, the line will not make a dot when you tap, it will make a line. You will have to click the trashcan many times to erase sometimes, you can click the green flag to erase too.